Apparatus for mixing concrete.



A. E. DAVIS.

APPARATUS FOR MIXING CONCRETE. APPLICATION FILED DEC. 11, I914.

LQMAW, Patented July 10, 1917.

mvgmoa dam/v AsTURNEYS A. E. DAVIS.

APPARATUS FOR MIXING CONCRETE.

APPLICATION FILED DEC-11.1914.

Patented July 10, 1917.

2 SHEETS-SHEET 2 Hilwm INVENTOR S E s S E N W W one.

ANTHONY E. DAVIS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR 0F ONE-HALF TOFREDERICK J. GEIGEB, OF PHILADELPHIA, PENNSYLVANIA.

APPARATUS FOR MIXING CONCRETE.

Specification of Letters Patent.

Patented July 1d, 191 l.

Application filed December 11, 1914. Serial No 876,641.

To all whom it may concern:

'Be'it known that I, ANTHONY E. DAVIS, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful'Apparatus for Mixing Concrete, of whichthe following is a specification.

In the apparatus ordinarily employed in the making of a concretemixture, it has been found impossible to obtain the same results whichare obtained by mixing the aggregates by hand after the first batch hasbeen mixed, since, under ordinary practice, the aggregates and water areplaced in a mixer, and after the mixing apparatus is actuated, the wetparticles of the mixture adhere to the mixing side of the chamber, sothat in the succeeding batches, the particles of coarse materialemployed are not uniformly coated with a film of cement and .ahomogeneous product is not obtained.

It is the object of my present invention to devise an apparatus formixing concrete which will overcome the defects above noted and whereinthe cement and sand, or the cement, lime and sand together with thecoarser material forming the aggregates are first mixed in a drycondition and after being thoroughly mixed are discharged into a secondmixing mechanism together with the necessary amount of water and by suchmeans each particle of the aggregate has -the requisite coating ofcement thereon, and

a uniform and homogeneous mixture is produced.

With the above in view my invention consists of anovel apparatus formixing concrete.

Other objects and advantages of my in vention will hereinafter moreclearly appear in the detailed description thereof.

For the purpose of illustrating my invention, I have shown in theaccompanying drawings one form thereof which is at present preferred byme, since the same will give 1 in practice satisfactory and reliableresults, although it is to be understood that the variousinstrumentalities of which my invention consists can be variouslyarranged and organized and that my invention is not limited to theprecise arrangement and organization of these instrumentalities asherein shown and described.

Figure 1 represents,.in sectional elevation, an apparatus embodying myinvention.

The apparatus employed in carrying out my invention may vary widely inconstruction and in the form shown for purposes of illustration, 1designates a vehicle of any desired or conventional type on which ismounted an engine or motor 2 of any desired or conventional type. 3designates the connecting rod which is operatively connected with themain driving shaft 4. 5 designates a gear keyed on the shaft landprovided with a clutch mechanism 6 whereby it may be moved into and outof engagement with a gear 7 carried by a shaft suitably journaled, and 8designates a sprocket wheel mounted to rotate in unison with said shaftand provided with a sprocket chain 9 which passes around a sprocketwheel 10 fixed to a mixing drum 11. The drum 11 is provided at its endswith the bearings 12 which are mounted on the grooved rollers 13 carriedby the standards 14 which latter are mounted on the vehicle frameworkThe drum 11 has its central'portion cylindrical and is tapered towardeach end and is provided with any desired-number of baffles 15 which maybe arranged in any desired manner, it being understood that thesebaffles extend preferably from one end of the drum 11 to the other endthereof. Provision is made for discharging material from the centerportion of the drum at any desired place thereof by providing a seriesof slides 16 which engage the walls of the groove 17 in the shell of thedrum to control the series of closely related apertures 50. 18designates a stationary hopper which is carried by standards 19 mountedon the vehicle framework. The shaft 4 has mounted thereon a sprocketwheel 20 which is interlocked with the shaft 4E by means of clutchmechanism 21 and a sprocket chain 22 is provided which passes around asprocket wheel 23 mounted to rotate in unison with a gear 241, whichlatter is in mesh with a gear 25 carried by a shaft 26 journaled in acontainer 27, The shaft 26 is provided with mixing or stirring blades 728 the construction and arrangement of which may be widely varied andstill be within the spirit of my invention. The container 27 is providedwith a discharge opening29 which communicates with a discharge spout 30.

31 designates a conduit through which water may be discharged into thecontainer 27 simultaneously with the discharge of the aggregates fromthe drum 11. I preferablyprovide a power loading device whereby theaggregates may be placed in the rotating drum 11 and for this purpose Iprovide a measuring bucket 32 whichis provided with rollers 33 whichtravel on the standards 34 which form guides and which are pivoted attheir upper ends, at 35, to the standards 19 and are provided with ahook 36 which engages a lug 37 on said standards. The bail 38 of thebucket 32 is connected at 39 to the lower end of the bucket and saidbail has removably connected therewith a cable 40 which passes overpulleys 41 carried by the standards 19 and over the pulley 42 to awinding drum 43. Said drum 43 is provided with a clutch mechanism 44whereby the gear 45, which is mounted to rotate in unison with said drum43, may be moved into or out of mesh with a gear 46 fixed on the maindriving shaft 4. The main driving shaft 4 is preferably provided withfly wheels 47. The upper ends of the. guide members 34 are deflected toform an inwardly extending flange 48, see Fig. 2, so that when themeasuring bucket is raised the upper rollers 33 will abut against saidflanges so that the measuring bucket will be tilted and the contentsthereof are discharged therefrom into the stationary hopper 18.

In the operation, the aggregates are placed in the hopper 18 either byshoveling the same thereinto or by placing them in the measuring bucket32 and actuating the clutch mechanism 44 to cause the same to beautomatically discharged into the stationary hopper 18 from whence theypass into the drum 11. The slide 16 which has previously been opened topermit discharge of the material from the hopper 18 intothe drum 11 isnowclosed and the clutch .mechanism 6 is actuated to operatively connectthe sprocket wheel 10 with the main driving shaft 4 whereby the drum 11is continuously rotated.

The rotation of the drum continues until the dry aggregates have beenproperly mixed and this mixing action is increased owing to since thecement in a wet state adheres to the walls of the mixing chamber. Inaccordance with my present invention, I am enabled to obtain at alltimes a uniform and homogeneous product.

' The apparatus shown illustrates one manner of carrying out theinvention in practice and is a simple and compact construction so thatit will occupy but a minimum amount of space. The guides 34 may bedisconnected and also the measuring bucket, so that the apparatus may beemployed between the curb of the road and the car track withoutinterfering with the traflic.

Owing to the provision of the slide or gate valves 16, any desiredopening in the drum 11 may be brought into register with the hopper 18or with the container 27, as is evident.

It is to be understood that changes in the construction may be madewithin the spirit and scope of the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A mixing drum rotatably mounted and provided with a series of closelyrelated apertures in its periphery and having individual closurestherefor, said drum having mixing elements therein adjacent to and beloweach of said openings.

2. A mixing drum provided with a series of closely related apertures inits periphery having individual closures, and longitudinal mixerdeflectors below said apertures and within the drum.

3. A mixing drum rotatably mounted and provided with a series of closelyrelated apertures at the central portion of its periphery, individualmeans to close each aperture, and

a battle within the drum beneath each aperture.

ANTHONY It. DAVIS.

